111021002219978 has 4 divisors (see below), whose sum is σ = 166531503329970. Its totient is φ = 55510501109988.

The previous prime is 111021002219957. The next prime is 111021002220001. The reversal of 111021002219978 is 879912200120111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 103887525105529 + 7133477114449 = 10192523^2 + 2670857^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27755250554993 + ... + 27755250554996.

Almost surely, 2^{111021002219978} is an apocalyptic number.

111021002219978 is a deficient number, since it is larger than the sum of its proper divisors (55510501109992).

111021002219978 is an equidigital number, since it uses as much as digits as its factorization.

111021002219978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55510501109991.

The product of its (nonzero) digits is 36288, while the sum is 44.

The spelling of 111021002219978 in words is "one hundred eleven trillion, twenty-one billion, two million, two hundred nineteen thousand, nine hundred seventy-eight".